Officials in San Diego County have issued an alert after three people have suffered documented fatal overdoses from a new form of the drug fentanyl know as carfentanil. It would only take 2 mg of the drug to cause a deadly overdose meanwhile it would only take .02 mg of carfentanil to have the same fatal results, CBS Sacramento reported. Langdon Fielding is an emergency veterinarian at Loomis Basin Equine. He said he uses fentanyl on horses for pain relief. "Basically it's super strong morphine-like a really strong drug to control pain," said Fielding. Carfentanil is similar to fentanyl but...